Examine source code of Copy Tab URL

{
  "manifest_version": 2,
  "name": "Copy Tab URL",
  "short_name": "CopyTabURL",
  "author": "MarsCat",
  "description": "Copies the URL from a tab.",
  "version": "0.2",
  "developer": {
    "name": "MarsCat",
    "url": "https://github.com/mjanetmars/copy-tab-url"
  },
  "icons": {
    "48": "copy_tab_url.svg",
    "96": "copy_tab_url.svg"
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "clipboardWrite",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b7ff41b7-4bda-456e-9c48-0a1c605518c4}"
    }
  }
}